Improvement



H. EARL. Evaporatjng Pan,

Patented Apr. 25,1865.

Inventor;

Witnesses;

AM. PHOT0-LITHO.CO.N.Y. (OSBORNE'S PROCESSJ UNITED HENRY EARL, on nnwAnns, new YORK.

IMPROVEMENT, IN SAP=PANS.

Specification forming part of Letters Patent No. 47,40i, dated A i1'il;25,l8fi5.

To all who-m it may concern/3 Be it known that I, HENRY EARL, of Edwards, in the county of St. Lawrence and State of New York, have invented certain Improvements in Sap-Pans, of which the following is a specification.

My invention consists of improvements in the arrangements and fixtures of a sap-pan, by means of which the sap. is .admittedto the pan in a heated state, and therefore does not check the evaporation, and by means of which the sap as it becomes more condensed passes to the outer and cooler parts of the pan, and, finally, can be drawn off without checking the fireor at all interfering with the process of evaporation.

l ment B of the feeding-pipe A, to prevent the passage of any extraneous matter into the feed ing-pipe, and thence into the sap-pan.

D is the steam-pipe, through which the feeding-pipe A passes, thus securing the heating of the sap before it reaches the pan. The

feeding-pipe A is curved, so as to allow the outer end of ,the steam-pipe D to be a little lower than the other end, that the drip or condensed steam to fall outside of the pan, in-

stead of being allowed to run back into the pan to be again evaporated. The vertical part E of the steam-pipe D rests upon the cover F of the steambox, directly over and around the orifice through said cover, into the steam-box. The vertical part G of the feeding-pipe A passes through said orifice in l the cover of the steam-box and nearly to the bottom of the movable pan placed in said box.

H is a movable pan placed in the steam-box and resting upon legs I, or supported in any other suitable manner.- Said panHshould be enough smaller than the steam-box to allow a free passage for the steam on one or more of its sides between the said pan and the PATENT OFFICE sides of the steam-box, and is so constructed with vertical partitions or divisionrplates as l to furnish a continuous channel for the sap from the place of ingressgat the centcr to the point J, where it flowsinto thesteam-box, asf represented in drawings. i e l l 1 e i K is the steam-box, which is situatedover the hottest part of the fire, and into which the sap flows at the point J, and, after passing, across the bottom of said box K, escapes by i an orifice at the point L into the main pan. M is the main pan, which is also divided by vertical partitions or division-plates, as rep-j resented in the drawings, into afcontinuous winding channel from the point L, where the sap flows into the said main pan M, to they point N, where the completed sirup isdrawn. from the pan by mea of a stop-cock or faucet placed in the orifice N. V

O is a slide or gate, by which the outward passage of the nearlycompleted, sirup is 1 stopped to allow the completed sirup to be all drawn off, or to prevent the completedsirnp. from mixing back with the inflowing sap when. t the fire is allowed to godown at nightAItg may also serve to regulate the flow of the sap.

through the winding channel of the panby being properly adjusted for that purpose. The] direction of the steam from the steam-box K i to the point where it escapes from the steampipe D'into the air is indicated by blue ar- 1 rows, and the direction of the sap from the] place of admission, B, to the point N, where the sirup is drawn from the pan M, is indip cated by red arrows. l

Operation: A sufficient quantity of sap is i admitted to cover the entire bottom of the 1 pan to the depth of about two inches. The 1 fire is then started, and whenthe sap begins to boil a sufficiently large stream of sap isadmitted into the pan bya stop-cock, faucet, or other means, to maintain the sap constantly at L about the same depth. When the sirupjin the outer channel of the pan is sufiiciently c0ndensed, it is drawn ,of fby meansof thestop cock in the orifice N, "care being takento so arrange the stop-cocks that the sirup shall be drawn off no faster than thdcondtnsationis 5 completed, and that the sap shall be admitted. l fast enough, and no faster, than to maintain two inches. The steam that is developed by;

the sap at the same uniform depth of about the evaporation of the sap in the's'team-bor; K I with the steam-pipe D, substantially as and is forced to escape by the steam-pipe 1); thus heating the inflowing sap and preventing any check to the process of evaporatiouby the i11- troduotion of cold sap to the pan.

Among-the advantages of my invention are the following: First, the inflowing sap is heated before it enters the pan, and before it escapes from the movable pan H into the steamboX K it has reached or almost reached the boiling -point second, the sap is admitted nearly at the center of the pan, directly over the hottest part of the fire, and as the evaporation continues and less heat is required to complete the process, it approaches the outer edges 'of the pan, where less heat is received, thus proportioning the amount of heat applied to the requirements of the process; third, the sirup may be drawn off as fast as completed; and, fourth, by means of the slide or gate 0 the sirup may be prevented'i rom mixing back when the fire is allowed to go out.

I claim- 1. The combination of the receiving-pipe A for the purpose set forth.

2. The combination of the movable pan H with the pipes A and D, substantially as and for the purpose set forth.

3. The combination of the steam-box K with p the movable pan H, substantially as and for the purpose set forth. a

4: The combination of the main pafi M with .the steam-box K, substantially as and for the purpose set forth.

' 5. The combination of the slide or gate 0 with .the main pan M, substantially as and for thepurpose set forth.

6. The winding arrangement or channeling the pan, by means of which'the sap' being admitted at the central or hottest part of the pan is conducted to the outer or cooler parts of said pan, substantially as described, and for the purposes set forth.

HENRY EARL.

WVitnesses:

L. M. GARDNER,J1-.,

A. S. WHrrmg- 

